1. An investigator who is employed to find missing persons or missing goods 
2. An instrument used to make tracings 
3. (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes 
4. Ammunition whose flight can be observed by a trail of smoke
   - tracer bullet

Derived forms: tracers

See also: trace

Type of: ammo, ammunition, detective, instrument, investigator, police detective, radioisotope, radionuclide, tec

Encyclopedia: Tracer

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• clear and present danger
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• clearing bank